AE render as M2V

I know that rendering to lossless is better practice than rendering with a codec usually, but I'm under a crunch to render ideally for a DVD.

My issue is that rendering in the MPEG-DVD format has been altering the length of my comp. It's only about a 6:45 minute video to loop that has no sound, but after the render its coming in at 5:33. I've checked and rechecked my settings so far as making sure to render the length of the comp. The whole 6:45 is in the 5:30 video, just sped up slightly.

Is there something I'm missing with the frame rate conversion?

My comp settings are set to 720x480 (1.21) at 29.97 fps.


The video will work for what we need it to in the rush, but I'm trying to learn what's going on for future reference.

Thanks,

Rob